Fix ConfigUtil's javadoc to use @param instead of invalid @params

With commit 85279183ecdef19cb82e34138ed2b24307f888d0, ConfigUtil's
javadoc started using the invalid @params (trailing 's') javadoc
keywords. Due to Java 8's stricter handling of javadoc, using @params
made building the plugin-api-javadoc.jar artifact fail with (edited
for readibility) [1]:

  gerrit-server/[...]/ConfigUtil.java:272: error: unknown tag: params
   * @params defaults instance of class with default values
     ^

Hence, we fix the keywords to the valid @params to allow building on
Java 8 again.

[1] See
http://builds.quelltextlich.at/gerrit/nightly/master-java_8/2015-09-13/plugin-api-javadoc.jar.build.stderr.txt
http://builds.quelltextlich.at/gerrit/nightly/master-java_8/2015-09-13/index.html#plugin-api-javadoc.jar

Change-Id: Ic9d3d2e906f53b125dd5febb4bcb6540b15c5b77
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/config/ConfigUtil.java b/gerrit-server/src/main/java/com/google/gerrit/server/config/ConfigUtil.java
index feea1ad..da9af93 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/config/ConfigUtil.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/config/ConfigUtil.java
@@ -269,7 +269,7 @@
    * @param section section
    * @param sub subsection
    * @param s instance of class with config values
-   * @params defaults instance of class with default values
+   * @param defaults instance of class with default values
    * @throws ConfigInvalidException
    */
   public static <T> void storeSection(Config cfg, String section, String sub,
@@ -323,7 +323,7 @@
    * @param section section
    * @param sub subsection
    * @param s instance of class in which the values are set
-   * @params defaults instance of class with default values
+   * @param defaults instance of class with default values
    * @return loaded instance
    * @throws ConfigInvalidException
    */